Finding the Fourth Proportional to 300,028.59, 413,327.61 and 209,219.49

Step by Step Solution

1. Step 1: Write the proportion equation
   300,028.59 : 413,327.61 = 209,219.49 : x
2. Step 2: Convert to fraction form
   300,028.59/413,327.61 = 209,219.49/x
3. Step 3: Cross multiply
   300,028.59x = 413,327.61 × 209,219.49
4. Step 4: Simplify right side
   300,028.59x = 86,476,191,767.12
5. Step 5: Solve for x
   x = 86,476,191,767.12/300,028.59
6. Step 6: Final answer
   x = 288,226.50